Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c5e83d369937e4…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 13:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ad3af32cade73b9564746c9aba435be SHA-1: 74f747945f32a3e90c215d44724e431b339223db SHA-256: 30c5e83d369937e43ec155d3c82503a73a62f6cc2d1a71b16a00e07671bd6337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a collection of links, potentially to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=theme+of+the+road+not+taken+poem
    • http://mothertheresapublicschool.com/userfiles/file/5709248987.pdf
    • https://nikosdimos.gr/userfiles/file/sajonuzegobamopagukamav.pdf
    • http://poultech.net/d/files/bexeb.pdf
    • http://abbuffalowings.com/uploads/files/memamosafodiwisorevam.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396df80d463---81982850342.pdf
    • http://pijntherapie.be/uploads/files/nebivuvosinenewozizekidu.pdf
    • http://jwconsult2005.com/file_media/file_image/file/kemapilawe.pdf
    • http://d-a-s.cn/userfiles/file/lusudotubi.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/53083746370.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb7ce6e71---42783629880.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9b0c28425826238afc003af1906bfd54/14393475485.pdf
    • http://noospc.ru/SITE/files/editor/file/43167293014.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323d15cec31---zipuvajekaneg.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b8a1f85ca3f6ca32ed928d2c14ae3434/66897258358.pdf
    • http://alexlunacoach.com/img/editor/file/fegoleworokigivasebuze.pdf
    • http://vector-mebel.ru/uploads/files/ropukudunoxop.pdf
    • http://sattosushi.com/uploads/files/96647554038.pdf
    • https://www.zochrot.org/ckfinder/userfiles/files/lorudixokuxedupilimid.pdf
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/8954165525.pdf
    • http://isvpro.com/custom/files/zomuxunajugupaxobifisofiv.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/88735690527.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/gt3oqcdt5lar88hv0j9fg2a8pr/79820552310.pdf
    • https://gizaviation.com/uploads/files/terisutilabodelasipakeza.pdf
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/mudenumogemu.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613854f18d56c---waruvuzo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77f.bin
07372383476133154c29826523f687cdee99d026f962936af916b5b930c7c57b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 17136 bytes
font_01_sfnt_off000103bf.bin
6e7c69b7b0fc4b4ea41a2091465a1cdd690dde14c36e0ebfe471acf7ef69e111
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 10512 bytes
font_02_sfnt_off00011b7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 16792 bytes